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To test the fuel pressure regulator on a 1991 Toyota 4Runner V6, first, relieve the fuel system pressure by removing the fuel pump fuse and starting the engine until it stalls. Next, connect a fuel pressure gauge to the fuel rail's test port. Start the engine, and observe the pressure reading; it should be within the manufacturer's specifications (typically around 30-40 psi). If the pressure is too low or fluctuates significantly, the fuel pressure regulator may be faulty and should be replaced.
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